Many users are reporting repeated issues with the dreaded Error 100 message in Apples new Mac App Store. However, it is really easy to get past this issue.
- Open Safari.
- Go to Safari > Preferences and click on the Security tool on the toolbar.
- Click Show Cookies.
- Highlight all *apple.com cookies and click Remove.
- Log out of your computer and log back in.
That is all there is to it!